Windows doesn’t recognise a linux file system and assumes it is in need of formatting.
Manual steps 
2 - Enable SSH & WiFi
While the microSD card is still in the card reader of your Laptop/Desktop, in File Explorer (Windows) or Finder (Mac) click on drive letter of the microSD card (labelled boot) to open it. It will open folder /boot which has many files & few folders.
2.1 - SSH
In the folder /boot, create a new text file and name it ssh
For further details, please see “For Beginners - How-to SSH to RPi - Setup Putty in Windows”
For Piaware SD card image
username = pi
default password = flightaware
.
2.2 - WiFi (only if required)
In the folder /boot, you will find a file named “piaware-config.txt”. Open this file using a text editor like Notepad (Windows) orTextEdit (Mac).
In the opened file “piaware-config.txt”, scroll down till you see this text:
wireless-ssid MyWifiNetwork
wireless-password s3cr3t99
Replace MyWifiNetwork by your router’s wifi ssid, and s3cr3t99 by your router’s wifi password
To enable autmatic updates, while being in a ssh session issue the follwing commands:
sudo piaware-config allow-auto-updates yes
sudo piaware-config allow-manual-updates yes
This will enable you to update via the Flightaware stats page.